<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<script type="text/javascript">
function chkNumber(eleText) {
var value = eleText.value;
var len = value.length;
for(var i = 0;i < len;i++) {
if(value.charAt(i) > "9" || value.charAt(i) < "0") {
alert("含有非数字字符");
eleText.focus();
break;
}
}
}
</script>
</head>
<body>
<input type="text" id="d1" onblur="chkNumber(this)"/>
</body>
</html>